中文摘要：

加拿大盆(CB ) 是在北极的最大的亚盆，与最深深渊 3 850 m 的平原。双 diffusive 过程是地热的精力通过影响上述孤立的深水的可能的经过。与在 2003 的 temperature-salinity-pressure 观察， 500-m-thick 转移层并且降低同质的层在中央深 CB 在 2 400 m 下面被发现的 1 个 000-m-thick 底部。有向下增加的温度和咸度的楼梯在转变层是突出的，建议在深 CB 的 doublediffusive 传送对流。楼梯的接口是与 0.0010.002 厚的大约 10 m ?? 汳灯 ? 湩琠敨爠湡敧戠瑥敷湥 ?? 愠摮 ???甠楮獴 吗？

英文摘要：

The Canada Basin （CB） is the largest sub-basin in the Arctic, with the deepest abyssal plain of 3 850 m. The double-diffusive process is the possible passage through which the geothermal energy affects the above isolated deep waters. With the temperature-salinity-pressure observations in 2003, 500-m-thick transition layers and lower 1 000-m-thick bottom homogenous layers were found below 2 400 m in the central deep CB. Staircases with downward-increasing temperature and salinity are prominent in the transition layers, suggesting the double- diffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001-0.002℃ temperature difference, while the thicknesses of the homogenous layers in the steps decrease upward from about 60 to 20 m. The density ratio in the deep central CB is generally smaller than 2, indicating stronger double-diffusive convection than that in the upper ocean of 200-400 m. The heat flux through the deepest staircases in the deep CB varies between 0.014 and 0.031 W/m2, which is one-two orders smaller than the upper double-diffusive heat flux, but comparable to the estimates of geothermal heat flux.